Pullman case steering wheel device

Abstract

An automatically retractable swivelling wheels device of a pullman case is disclosed. The swivelling wheels device comprises a bushing, in which a spring retainer is formed on a bottom of a circumferential flange of the bushing, a wheel housing assembly and a swivelling wheels. The swivelling wheels is permitted to swing in any direction as the pullman case moved by a force, and once the force is removed, the swivelling wheels is automatically returned to its original direction by the cooperation of the restoration force of two out of shape springs provided in a C shaped groove of the wheel housing assembly with the spring retainer therebetween in order for the swivelling wheels to be retracted to a recess of the pullman case.

What is claimed is: 
     
       1. A pullman case steering wheels device, comprising: a bushing, coupled with a wheel bracket of the pullman case, in which a spring retaining member is formed on a bottom of a circumferential flange thereof;   a wheel housing assembly which comprising a rotating shaft formed on a center of a surface thereof for being inserted into the bushing, a body formed under the rotating shaft, a wheel housing extended downwardly from the body with two holes formed in a center of each side thereof, a C shaped groove formed on a surface of the body opposite to the circumferential flange of the bushing, and two springs provided on the C shaped groove separated by a predetermined distance; and   a swivelling wheels rotatably fixed in said center hole of the wheel housing.   
     
     
       2. The pullman case steering wheel device of claim 1, wherein a center portion of said retainer member is disposed correspondingly with a center of the C shaped groove. 
     
     
       3. The pullman case steering wheel device of claim 1, wherein one end of one said spring is engaged with one end of said retaining member and one end of other said spring is engaged with the other end of said retaining member. 
     
     
       4. The pullman case steering wheel device of claim 1, wherein said two springs are helical springs.